Email time elapsed between sent and received

Hello,
When sending email to my email (hosted at discountasp.net under empiresoft.com), it takes generally over 20 minutes before it is received.
I've tested sending from different emails and providers, and it is in general 20 minutes.
However, when sending from those places and emails, sendign to Hotmail or GMail, it takes 1 or 2 minutes.
Is there a way to accelerate this here at discountasp.net?
Or is it that Hotmail and GMail are quicker.
Thx
Christian